Open-hearth furnace



F. CARTER AND D. McLAlN.

OPEN HEARTH FURNACE. APPLICATION FILED MARHIZ, 1917- 1,331,804. I Patented Feb. 1920.

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F. CARTER AND n. MCL/IIN.

OPEN HERTH FURNACE.

, APPLICATION FILED MAII. 1 2, I911. I. v 1,331,804. Patented Feb; 24,1920.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

FRANK CARTER, oE-MINNEAPLIS, MINNESOTA, AND DAVID MCLAIN, 0E MILWUKEE,

WISCONSIN.

OPEN-HEARTH FURNACE.

Specicatio of Letters Patent.

Application led March 12, 1917. Serial No. 154,353.l

To all whom it may concern.'

Be it known that we, FRANK CARTER and DAVID MCLAIN, citizens of the United States, and residents of Minneapolis, Hennepin county, Minnesota, and Milwaukee, Milwaukee county, Wisconsin, respectively, have invented new and useful Improvements in Open-Hearth Furnaces, of which the following is a description, reference being had to the accompanyingdrawings, which are a part of this specification.

This invention relates to open hearth furnaces and has for its object to provide a vertical port for the air uptake which directs the current of comparatively cool air against the roof of the furnace to assist in preventing the over heating thereof, instead of deilecting the air flow to the bath of molten metal to cool it, as with the usual inclined air port. y

With the above and other objects in view the invention consists yin the open hearth furnace as herein claimed and all equivalents. y

Referring to the accompanying drawings in which like characters of reference indicate thesame parts'in' the different views:

Figure 1 is a longitudinal sectional view of an open hearth furnace constructed in accordance with this invention, the reversing valve and one of the regenerating chambers being also shown in section;

gig. 2 is a sectional plan view thereof; an

Fig. 3 is a transverse sectional view thereof. i

In these drawings 10 indicates a foundation on which is supported a base or platform 11 having the walls of the furnace 12 erected thereon as usual, while the two air regenerators 13 containing the air heatingy brick checker work 14 are located therebeneath and are connected by means of a reversing' valve 15 either with the air intake valve 16 or the flue 17 leading to the chimney stack, all as usual. The furnace as usual is provided with an air uptake 18 at each end leading from one of the regenerators 13 and such air uptake, instead of terminating in a downwardly deflecting port as usual, continues in its upward direction as it opens into the interior of the furnace so that the current of heated air therethrough is directed vertically against the roof of the furnace. -At each end wall or bulkhead of the furnace is a small .inclined opening 19 through which an oil burner 2O maybe inserted in an inclined position as shown to direct the stream of fuel downwardly toward the middle of the metal bath 21 where it is desired that the heat should be most intense. across the upwardly directed current of air so as not to affect the direction of the air iowby induction. This arrangement enables the stream of fuel oil and compressed air from the burner nozzle 20 to travel alone tothe center of the `metal bath and there intake has been heated to a high temperaturein its passage through the re'generator, its temperature is much below that of the furnace and when directed against the surface of the metal it has a .tend- -ency to co0l the metal before entering into combustion with the fuel `and thus retard the operation. By directing the air from the regenerator to the roof of the furnace instead of to the Surface of the metal bath a double purpose is accomplished; the roof is cooled by the air and is thereby rendered more durable, and the metal is not deprived of its heat by the iniowing air. further advantageous result under proper conditions will be the delay of the combustion until the fuel reaches the center ofthe metal bath which result may be more readily accomplished when the fuel and air-travel in separate streams commingling at the center of the furnace. f

The two ends of the furnace are of like construction so that in feeding from either end the same principles apply, the portion 'of the roof subjected to greatest heat during operation from one end being subjected to the cooling action of the inflow o-f air when operating from the other end.

To facilitate'the introduction of fuel and air in separate strata, the air remaining above the fuel and not commingling therewith to any great extent until reaching the center of the furnace, the furnace is made narrow and the ceiling high.

The oil burner projects- Patented Feb. 24, 1920.

.inclined ports of furnaces of usual construction.

It is to be understood that this invention is limited to no specific form or arrangement of parts except in so far as such limitations are specified in the claims.

What we claim as new and desire to secure by Letters' Patent is:

1.`An open hearth furnace, comprising a narrow furnace chamber with a high roof,

and contracted end portions, air intakes opening to the interior of the furnace chamber at the ends thereof through vertical ports the full Width of such contracted portions and inclined oil burners passing through the end walls of the furnace chamber and across the path of air from the vertical ports.

` 2. An open hearth furnace comprising a furnace chamber with contracted end portions, air intakes opening to the interior of the furnace chamber at the ends thereof through vertical ports in the contracted portions, and an inclined oil burner passing thro-ugh one of the end walls of the furnace chamber and across thepath of air from the Vertical port at this end.

3. An openhearthffurnace comprising a furnace chamber, air intakes opening to the interior of the furnace chamber at the ends thereof through Vertical ports, and an inclined oil burner passing through one of the end walls of the furnace chamber and across the path of air from the Vertical port at this end.

In testimony whereof, we afliX our signatures, in presence of two witnesses.

FRANK CARTER. DAVID MCLAIN.

Witnesses:

R. S. C. CALDWELL, H. D. CHASE. 

